Attachment-plug.



EL DORADO JONES.

ATTACHMENT PLUG.

' APPLICATTON FILED MAY 1,1914.

, Patnted June 1, A1915.

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DQIR'ADOV JON-ES, OF MYGLNE, ILLINOIS,

ATTAGHMENTeFLUG.

Specication of Letters atrnt.

latented* June il, i915.

Application led May 7, 1914. Serial 13T o. 836,848.

T0 fzZZ whom #may concern.'

lle it known that I, EL DORADO JONES, a Acitizen of the United Statesv of America, and a resident of Moline, in the county of Rock Island, State of Illinois, have invented certain new and useful Improvements in Attachment-Plugs, of which the following is a specification. This invention relates to that type of attachment plugs used to make electrical connection between the flexible conductors or portable electrical appliances and the wall sockets of buildings. And the present improvement has for its object to provide a simple and efiicientstructural formation and larrangement of parts in an attachment'plug of the class described, combining the features of the ordinary non-separable plug and the ordinary separable plug, and in which the extended 'ump spark usual to the ordinary non-separa le plug is reduced t0 a minimum with a corresponding reduction in the high tension impulse which is sent through the electrical appliance, and the consequent corrosion of the metal portions of the plug due to the same, all as will hereinafter more fully appear.

' 1n the accompanying drawings: Figure 1, is an enlarged central section ofan attaching plug, embodying the present invention, with the parts in an electrically connected position. Fig. 2, is a similar view, with the parts in an electrically disconnected position. Fig. 3 is a cross-section on line m-, Fig. l. 111g. 4, is a similar view on line Fig.

Similar reference numerals indicate like parts in the several views.

Referring to the drawings, 1 represents the outer shell or housing of the plug, formed of any usual and suitable non-electric material, and having a central bore forming a receiving cavity in which the hereinafter described movable head or member is slidingly mounted. Said parts are held from independent rotation by any usual non-circular formation of the periphery of said movable head and a corresponding formation of the central bore of said shell 1, preferably by a longitudinal groove and spline formation 2 and 3 on the respective parts, as shown more particularly in Figs. 3 and 4.

4 is a head closing one end of the central bore of the shell and provided with a pair of orifices for the reception of the ends of the pair of resilient contact fingers or bars 5 and 6, of the shell or housing 1. Said contact fingers are secured to the head 4, and to the wires of the usual flexible conductor 7, and 1n the .present improvement said resilient contact fingers 5 and 6 are disposed in parallel and separated relation and extend in to the central bore of the shell 1, for electrical engagement with the hereinafter described pair of contact fingers of the movable head of the plug, above referred to.

8 is a cap or cover screwed or otherwise secured to the shell 1 to cover and conceal the above described connections between the head 4, contact lingers 5, 6, and wires of the flexible conductor 7 as usual in the present class of plugs. Said cap or cover'8 is formed with the usual central orifice for the passage of the flexible conductor 7 as usual in the present class of plugs. Said cap or cover 8 is formed with the usual central orifice for the passage of the flexible conductor 7 as shown in Figs. 1 and 2. v

9 is a spirally fluted casing flxedly at-v tached to the periphery of the shell 1, at the end opposite to the head 4, and adapted to screw into an ordinary lamp socket of a building or other structures. 1n the present improvement the casing 9 is electrically connected with a longitudinal contact strip 10 secured-to one side of the central bore of the shell orhousing 1, aforesaid.

11 is the movable head or number, above referred to, and which is formed of any7 usual and suitable non-electric material. Said head 11 is adapted to slide in one direction in the central bore of the shell 1,

. under the influence of a spring 12, preferably of the spiral type shown, and disposed between one end of the head 11 and the closure head 4, of the shell 1, as shown in Figs. 1 and 2. Thevhead 11 has a movement in an opposite direction to that above described, as the shell 1 is screwed into place in an ordinary fixed socket, due to an abutment of its end against the bottom of said socket.

413 and 14, are a pair of contact lingers carried `by the movable head or member 11, and arranged in parallel relation, preferably, in individual longitudinal passages formed therefor in said head or member 11. The contact linger 14 is provided with a right-angle contact flange or plate 15, which `is iixedly secured to one end of the head or member 11 to constitute a terminal adapted to contact with the usual main line terminal at the bottom of an ordinary socket. The other contact finger 13 is extended laterally through the head or member 11 and has sliding contact with the above described longitudinal contact strip 10 of the shell or housing 1. As before stated said strip 10 has electrical connection with the spirally fluted casing 9, which in turn is adapted to have electrical contact with the annular terminal of a stationary lamp socket of the building.

In the present construction the contact fingers 5, 6 and 13, 14 above described, are arranged in alined contacting pairs, which when the attachment plugis Withdrawn from the lamp socket, are forced out of electrical contact by the spring 12 aforesaid. 'With the introduction of the attachment plug into place, the aforesaid pairs of contact fingers are simultaneously brought toward each other, to simultaneously establish electrical connection between the respective pairs'of contact fingers, and With such simultaneous attainment of the respective connections, the usual sparking and high tension impulses sent along the line are reduced to a minimum.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is

1. Inan attachment plug, the combina.

tion of avpair of members formed to fit and have electrical connections With the terminals of a stationary socket, one of said members being movably mounted in the other member, a spring tending to move said movable member in one direction, and resilient contact fingers carried by said members i bers being slidingly mounted in a nonrevoluble manner in the other,` member, a spring tending to move said movable member in one direction, and resilient contact fingers carried by said members and disposed in pairs and adapted to be brought into electrical connection when the movable member has movement against the spring, aforesaid,

individual fingers of the respective pairs .l

having connection With the respective terminals of the plug, substantially as set forth.

3. In an attachment plug, the combination of a pair of members formed to fit and 4. In an attachment plug, the combination of a pair of members formed to fitand have electrical connections with the terminals of a stationary socket, one of said mem bers being slidingly mounted in a non-revoluble manner in the other member, a spring tending to move said movable member in one direction, a plurality of longitudinally arranged resilient contact fingers carried by said members and disposed in alined pairs adapted to be brought into electrical connection when the movable member has movement againstthe spring, aforesaid, individual fingers of the respective pairs Ihaving connection with the respective terminals of the plug, substantially as set forth.

Signed at Chicago, Illinois, this 4th day of May, 1914. j

EL noni/ino Jouns.

Witnesses ROBERT BURNS, IVA L. CRANE. 

